The first mammal cloned through nuclear transfer, Dolly (a female domestic sheep) was born on July 5, 1996. The cloned sheep was born having derived from three mothers; one gave the egg, one provided DNA, and a third sheep carried her. Dolly was cloned by Keith Campbell and Ian Wilmut at the Roslin Institute in Scotland, which is where she spent the entirety of her life.

Dolly was introduced to the public on February 22, 1997 when she was almost 1 year old. During her lifespan at the Roslin Institute, she was able to produce 6 offspring after being bred with a Welsh Mountain Ram. At the age of six, Dolly, known as the World’s Most Famous Sheep, developed progressive lung disease and severe arthritis and was euthanized on February 14, 2003.